GCSE Combined Science (AQA)

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Resistance in Series

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Electricity Series and parallel circuits

Resistance in Series

10:18 Series Circuits
Spec 4.2.2
Previous Current & Potential Difference in Series Next Cells in Series
  • Increasing the number of resistors in a series circuit increases the total resistance.
  • Charge carriers must pass through all resistors in series, losing energy with each resistor they pass through.
  • Example provided comparing two circuits with the same type of resistor but different quantities, demonstrating higher resistance with more resistors.
  • Total resistance in a series circuit is calculated by summing the resistances of all components.
  • Example calculation: A series circuit with two resistors, R1 and R2, has a total resistance of R1 + R2.
  • Higher total resistance in a circuit leads to a decrease in current, as current is inversely proportional to resistance.
  • Example provided comparing current flow in circuits with different numbers of lamps, showing lower current with higher resistance.
  • Potential difference in a series circuit is split among components based on their resistances.
  • Example calculation: In a circuit with a 24-volt cell, a 1-ohm lamp, and a 5-ohm resistor, the potential difference is divided into 4 volts across the lamp and 20 volts across the resistor.
  • Detailed example provided calculating total resistance in a circuit with two lamps, using series circuit rules and equations to find unknown values.
  • Final resistance calculation example: Adding the resistances of two lamps in series to find the total resistance of the circuit.

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